Kjeldahl?s method is not applicable for compounds containing nitrogen in nitro and azo groups and nitrogen present in the ring. Because nitrogen of these compounds does not change to ammonium sulphate under these conditions. Hence only Alanine can be used to determine percentage of nitrogen.
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Top Questions on Methods Of Purification Of Organic Compounds
We commonly use these methods for the purification of substances:
Simple crystallization - The most common method that we use to purify organic solids.
Fractional crystallization - It is the process of separation of different components of a mixture by repeated crystallisations.
Sublimation - Certain organic solids on heating directly change from solid to vapor state without passing through a liquid state. These substances are sublimable. This process is sublimation.
Simple distillation - It is the joint process of vaporization and condensation.
Fractional distillation - It is the process to separate a mixture of two or more miscible liquids which have boiling points close to each other